5956-04-7 ACHILLIN Azuleno[4,5-b]furan-2,7-dione, 3,3a,4,5,9a,9b-hexahydro-3,6,9-trimethyl-, [3R-(3.alpha.,3a.beta.,9a.beta.,9b.alpha.)]- Guaia-1(10),3-dien-12-oic acid, 6.alpha.-hydroxy-2-oxo-, .gamma.-lactone, (11R)- NSC156236